27 Example: ZooKeeper Preliminary unverified results. Do not use for analysis or conclusions. mkdir(v) creat(v/log)... write(v/log) fdatasync(v/log) return to user

28 Example: ZooKeeper Preliminary unverified results. Do not use for analysis or conclusions. mkdir(v) creat(v/log)... write(v/log) fdatasync(v/log) return to user

29 Vulnerabilities Preliminary unverified results. Do not use for analysis or conclusions.

30 Vulnerabilities: Consequences Preliminary unverified results. Do not use for analysis or conclusions. Many silent data loss, cannot open vulnerabilities

31 Vulnerabilities per File System Preliminary unverified results. Do not use for analysis or conclusions.

32 Patterns Preliminary unverified results. Do not use for analysis or conclusions. Appends need to be atomic Because of implementations of write-ahead logging Overwrites mostly don t need to be Append-before-rename only improves correctness lightly Might help more with different class of applications A file system design that is fast, but helps ALC

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Crashes and Recovery Write-ahead logging Announcements Exams back at the end of class Project 2, part 1 grades tags/part1/grades.txt Last time Transactions and distributed transactions The ACID properties